Process of producing matrices and stereotypes of celluloid.



UNITED STATES To aZZu/hom it may concern: a t a ,Be it known that 1, DAN LIoHTENBERe :MADSEN, a subject of the King of Denmark, residing at Odense, Denmark, have invented a new and useful Improvement in Processes of Producing Matrices and Stereotypes of Celjluloid, of which the following is a specificaf tion. 1 I H My invention relates to a process of manufacturing stereotypes of celluloid from matrices of celluloid, which matrices may be empployed for producing an indefinite number of celluloid stereotypes all exhibiting the fine- I l ness and detail of the original die or matrix. 15 I With this end in view I proceed as follows A mass of celluloid is first softened by heat and when in this condition a matrix the exact counterpart of an original die is formed a a therein by pressingthe die upon the softened 20 mass, and after this has been done the celluloid mass is permitted to cool and harden and l is then in condition for use.

In the production of a celluloid stereotype by means of the hard celluloid matrix I heat 25 the stereotype-plate and force the same into PATENT OFFICE.

DAN LICHTENBERG-MADSEN, OF oDnNsE, DENMARK.

PROCESS OF PRODUCING MATRICES AND STEREOTYPES OF CELLULOID.

i SPECIFICATION formingpart Of Letters Patent No. 672,534, dated. April 23, 1901.

Application filed September 30, 1898. Serial No. 692,318. (No model.)

the matrix in the celluloid mass, which mass being of course of greater proportions than the thin stereotype-plate will not be affected by the heated condition of said plate, and there will therefore be no danger of the adherence of said stereotype-plate to the matrix, and the fine lines of the matrix will he reproduced with perfection and exactitude upon said plate.

Having thus described my invention, what I claim is The process of producing stereotypes of colluloid which consists in first heating a mass of celluloid and forming a matrix therein, then permitting said mass to cool and harden;

then heating a celluloid plate; and finally pressing said plate when in a plastic condition into the cold celluloid matrix.

In witness whereof I have hereuntoset my hand in presence of two witnesses.

DAN LIOHTENBERG-MADSEN. 

